Improvement in fan-blowers



. ing drawings, forming improvements.

UNITED STATES PATENT OFFICE.

l FREDERICK OR'ILIEB, OF WILLIAMSBURG, NEW YORK.

IMPROVEMENT IN FAN-BLOWERS.

Specification forming part of Letters Patent No. 53,ll74, dated March 13, 1866.

.To all whom it may concern.'

Be it known that I, FREDERICK ORTLIEB,

' of Williamsburg, in the county of Kings and State of New York, have invented certain new and useful Improvements in Rotary Fan-Blowers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanypart of this specification, in whieh- Figure lis a plan view of a blower with my Fig. 2 is a side view of the same. Fig. 3 is a horizontal central section of the same. Fig. 4 is a vertical section of the same parallel with the planes of rotation.

Similar letters of reference indicate corresponding parts in the several figures.

One object of my invention is to prevent that action in fan blowers known as blowing back by providing a freer ingress for the air. This object I accomplish by attaching to the rotating portion of the blower and in range with thefan-wings, in contradistinetion from those blowers wherein tbe air is admitted or forced in through a central orifice around the axis of the fan-wings, two series of spiral or oblique blades, substantially like those of a screw-propeller, one series arranged at one side of the blower, having a right hand, and the other series arranged at the other side, having a left-hand Obliquity, so that as the said blades rotate with the fans they will catch the air and force it into the blower to be forced out by the fan-wings. I arrange the said spiral or oblique blades opposite to the fan-wings, and have no central openings to the blower, as by that means I obtainv a larger area of ingress for air in proportion "to the size of the fan.

Another object of my invention is to simplify the construction of the casing or shell of the blower; and to this end I form it of a single casting, or otherwise, with open sides, and provide for the bearings ofV the fan-spindle simple open yokes so bolted or otherwise secured to the casing that by the removal of one of them the Whole rotating portion of the blower can be drawn out sidewise without taking the casing or shell apart.

To enable others skilled in the art to construct blowers according to my invention, I will proceed to describe it with reference to the drawings.

A is the casing or shell, of substantially the same form as the casing 'of other blowers,iex ceptl that its sides have circular openings aa, of a circumference slightly larger than that of a circle circumscribing the outer edges of the fan-wings B B, and around these openings there are outwardly projecting cylindrical flanges b b. This casing I prefer to make of a single casting to save joints.

The fan-wings` B B are secured to a hollow cylindrical hub, C, which is keyed or otherwise rmly :secured to the spindle D. This hub closes up the central portions of the sides of the casing to exclude the air therefrom, and has iirrnly secured upon its exterior, outside of the fan-wings, the two circular series of spiral or oblique blades E E and E E', one upon one side and the other upon the other side of the fan-wings, the said blades resembling substantially those of a screw-propeller, and the series upon one side having an obliquity the reverse of those on the other-side. The blades of each series are connected together and supported by two concentric rings., c and d, the inner ring, c, being fitted on and secured tightly to the hub, and the outer ring, d, itting loosely to the cylindrical flange b on the corresponding side of the'casing. Each series of spiral or oblique blades and its two rings c and d may be made of a single casting. The spaces between thesaid blades form the onlymeans of ingress for air to the blower, and give an aggregate area much larger than could be obtained by central openings.

F F are two yokes, consistingof lcent- ,L hubs with radiating arms, the hubs containing or supporting the bearings for the spindle D, and the arms being bolted at e e to the casing or shell A. By removing one of these yokes the whole ofthe rotating portion of the blower, consisting of the spindle D, hub C, fan-wings B B, and spiral or oblique blades'E E and E E', can be drawn out through the opening a on that side of the casing A, leaving the said casing entire.

In turning the spindle D in such direction that the outer edges of the blades E E and E' E meet the air a very copious supply of air is forced through the spaces between said blades and into the part of the casing surrounding the hub C, and within range of the'fan-wings B B, where it is subject to the direct action of the said wings, by which it is compressed and forced out ofthe casing in the usual manner.

An important difference between the operation of this blower and that of an ordinary Jran-blower is that in this blower the air is forced into the casing on each side in range with the radial length of the fan-blades, While in others it is either drawn or forced in through an orice immediately around the axis of the fan-blades.

What l claim as my invention, and desire to secure by Letters Patent, is-

1. Arranging a series offspiral or oblique blades on each side, extendingcquidistant radially with the blades of' the fan-blower and rotating therewith, in the manner and for the purposes substantially as herein specified.

2. The construction of" the `hub C and arrangement of' the spiral or oblique blades E E and E E relatively thereto, wherebythe center ofthe casing of the blower is closed to the out without takin air, and the air is forced in directly in range of the fan-wings, substantiallyas herein de-v scribed.

The casin g constructed with -its sides opento the full circumference of a circle circumscribing the fan-wings and with yokes F F, by

the removal of one of ywhich the whole rotat- *i ing portion of the fan is allowed to bedrawn tially as herein se forth.

4. The combination and arrangement of the open-sided casing A, the hub C, closing the v v center of the said casing, the two series of spiral or oblique blades E E and E' E', the fan-wingsBjB, and the open yokes' F F, all substantiall y as herein specified.

FRED. onrnirns.l

Witnesses:

HENRY T. BROWN, J. W. GooMBs.

apart the casing, substan- 

